package com.kellyfeng.frame4j.helper;

import java.util.*;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.sql.*;
import org.slf4j.*;
import org.apache.commons.dbcp2.BasicDataSource;
import org.apache.commons.dbutils.*;
import org.apache.commons.dbutils.handlers.*;

import com.kellyfeng.frame4j.service.CustomerService;
import com.kellyfeng.frame4j.util.CollectionUtil;
import com.kellyfeng.frame4j.util.PropsUtil;

/**
 * @author Administrator 数据库操作助手类
 */
public final class DatabaseHelper {
	private static final Logger LOGGER = LoggerFactory.getLogger(DatabaseHelper.class);
	private static final QueryRunner QUERY_RUNNER;
	private static final ThreadLocal<Connection> CONNECTION_HOLDER;
	private static final BasicDataSource DATA_SOURCE;

	static {
		CONNECTION_HOLDER = new ThreadLocal<Connection>();

		QUERY_RUNNER = new QueryRunner();

		Properties conf = PropsUtil.loadProsp("config.properties");

		DATA_SOURCE = new BasicDataSource();
		DATA_SOURCE.setDriverClassName(conf.getProperty("jdbc.driver"));
		DATA_SOURCE.setUrl(conf.getProperty("jdbc.url"));
		DATA_SOURCE.setUsername(conf.getProperty("jdbc.username"));
		DATA_SOURCE.setPassword(conf.getProperty("jdbc.password"));
	}

	/**
	 * @return 获取数据库连接
	 */
	public static Connection getConnection() {
		Connection conn = CONNECTION_HOLDER.get();
		if (conn == null) {
			try {
				conn = DATA_SOURCE.getConnection();
			} catch (SQLException e) {
				LOGGER.error("get connection failure", e);
				throw new RuntimeException(e);
			} finally {
				CONNECTION_HOLDER.set(conn);
			}
		}
		return conn;
	}

	/**
	 * @param entityClass
	 * @param sql
	 * @param params
	 * @return 查询实体列表
	 */
	public static <T> List<T> queryEntityList(Class<T> entityClass, String sql, Object... params) {
		List<T> entityList;
		try {
			Connection conn = getConnection();
			entityList = QUERY_RUNNER.query(conn, sql, new BeanListHandler<>(entityClass), params);
		} catch (SQLException e) {
			LOGGER.error("query entity list failure", e);
			throw new RuntimeException(e);
		}
		return entityList;
	}

	/**
	 * @param entityClass
	 * @param sql
	 * @param params
	 * @return 查询实体
	 */
	public static <T> T queryEntity(Class<T> entityClass, String sql, Object... params) {
		T entity;
		try {
			Connection conn = getConnection();
			entity = QUERY_RUNNER.query(conn, sql, new BeanHandler<T>(entityClass), params);
		} catch (SQLException e) {
			LOGGER.error("query entity failure", e);
			throw new RuntimeException(e);
		}
		return entity;
	}

	/**
	 * @param sql
	 * @param params
	 * @return 执行查询语句
	 */
	public static List<Map<String, Object>> executeQuery(String sql, Object... params) {
		List<Map<String, Object>> result;
		try {
			Connection conn = getConnection();
			result = QUERY_RUNNER.query(conn, sql, new MapListHandler(), params);
		} catch (Exception e) {
			LOGGER.error("execute query failure", e);
			throw new RuntimeException(e);
		}
		return result;
	}

	/**
	 * @param sql
	 * @param params
	 * @return 执行更新语句(包括update,insert,delete)
	 */
	public static int executeUpdate(String sql, Object... params) {
		int rows = 0;
		try {
			Connection conn = getConnection();
			rows = QUERY_RUNNER.update(conn, sql, params);
		} catch (SQLException e) {
			LOGGER.error("execute update failure", e);
			throw new RuntimeException(e);
		}
		return rows;
	}

	/**
	 * @param entityClass
	 * @param fieldMap
	 * @return 插入实体
	 */
	public static <T> boolean insertEntity(Class<T> entityClass, Map<String, Object> fieldMap) {
		if (CollectionUtil.isEmpty(fieldMap)) {
			LOGGER.error("can not insert entity:fieldMap is empty");
			return false;
		}
		String sql = "INSERT INTO " + getTableName(entityClass);
		StringBuilder colums = new StringBuilder("(");
		StringBuilder values = new StringBuilder("(");
		for (String fieldName : fieldMap.keySet()) {
			colums.append(fieldName).append(", ");
			values.append("?, ");
		}
		colums.replace(colums.lastIndexOf(", "), colums.length(), ")");
		values.replace(values.lastIndexOf(", "), values.length(), ")");
		sql += colums + "VALUES " + values;

		Object[] params = fieldMap.values().toArray();
		return executeUpdate(sql, params) == 1;
	}

	/**
	 * @param entityClass
	 * @param id
	 * @param fieldMap
	 * @return 更新实体
	 */
	public static <T> boolean updateEntity(Class<T> entityClass, long id, Map<String, Object> fieldMap) {
		if (CollectionUtil.isEmpty(fieldMap)) {
			LOGGER.error("can not updete entity:fieldMap is empty");
			return false;
		}

		String sql = "UPDATE " + getTableName(entityClass) + " SET ";
		StringBuilder columns = new StringBuilder();
		for (String fieldName : fieldMap.keySet()) {
			columns.append(fieldName).append("=?, ");
		}
		sql += columns.substring(0, columns.lastIndexOf(", ")) + "WHERE id=?";

		List<Object> paramList = new ArrayList<Object>();
		paramList.addAll(fieldMap.values());
		paramList.add(id);
		Object[] params = paramList.toArray();

		return executeUpdate(sql, params) == 1;
	}

	/**
	 * @param entityClass
	 * @param id
	 * @return 删除实体
	 */
	public static <T> boolean deleteEntity(Class<T> entityClass, long id) {
		String sql = "DELETE FROM " + getTableName(entityClass) + "WHERE id=?";
		return executeUpdate(sql, id) == 1;
	}

	/**
	 * @param entityClass
	 * @return 获得表名
	 */
	private static String getTableName(Class<?> entityClass) {
		return entityClass.getSimpleName();
	}

	public static void executeSqlFile(String filePath) {
		InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(filePath);
		BufferedReader reader = new BufferedReader(new InputStreamReader(is));
		try{
		String sql;
		while ((sql = reader.readLine()) != null) {
			executeUpdate(sql);
		}
		}catch(Exception e){
			LOGGER.error("execute sql file failure", e);
			throw new RuntimeException(e);
		}
	}

}














